我正试图用PHP为学校作业创建一个登录和注册系统，但目前还没有真正起作用。。。
问题是它会产生一个错误，说字段是空的，即使你用数据填充了字段，所以它不应该给出这个错误。
代码：
<html>
<head>
<title>Music Database</title>
<link rel="stylesheet" href="layout.css" type="text/css" />
<?php
// Verbinden met de database //
include('connect.php');
// Registreer data verkrijgen en in variabelen zetten //
if(isset($_POST['r_submit'])){
$r_username = $_POST['r_username'];
$r_password = $_POST['r_password'];
$confirm_r_password = $_POST['confirm_r_password'];
$r_name = $_POST['r_name'];
$r_surname = $_POST['r_surname'];
$r_birth = $_POST['r_dateofbirth'];
$r_mail = $_POST['r_mail'];
}
?>
</head>
<body>
<div id="login">
<form name="login" action="login.php" method="post">
<p>Login: <input class="input" type="text" name="username" value="Username" />
<input id="password" type="password" name="password" value="Password" /></p>
<div><a class="link" href="register.php">Register here!</a></div>
<p align="center"><input class="submit" type="submit" name="login_submit" value="Submit" /></p>
</form>
</div>
<div id="header">
<a class="link" href="index.php">Music Database</a>
</div>
<div id="search">
<form name="search" action="search.php" method="post">
<p>Search for: <input class="input" type="text" name="search" value="<?php if(isset($_POST['search'])) print $_POST['search']; ?>" />
<input class="submit" type="submit" name="search_submit" value="Submit" /></p>
<p>Artist: <input type="checkbox" name="artistsearch" checked />
Album: <input type="checkbox" name="albumsearch" />
Song: <input type="checkbox" name="songsearch" />
Genre: <input type="checkbox" name="genresearch" /></p>
</form>
</div>
<div id="wrapper"><br /></div>
<div id="content">
<h1>Register down here please:</h1>
<table id="wrap_table">
<tr>
<td>
<div id="reg_content">
<div id="reg_form">
<form name="register_login" action="register.php" method="post">
<fieldset>
<legend>Login Data: </legend>
<table class="r_table">
<tr>
<td>Username<sup>*</sup>: </td>
<td><input class="input" type="text" name="r_username" value="<?php if(isset($r_username)){ print $_POST['r_username']; } ?>"/></td>
<?php
if(isset($_POST['r_submit'])){
if(!isset($r_username)){
echo "<td>Error: No Username has been entered!</td>";
}
}
?>
</tr>
<tr>
<td>Password<sup>*</sup>: </td>
<td><input class="input" type="password" name="r_password" value="<?php if(isset($r_password)){ print $_POST['r_password']; } ?>"/></td>
<?php
if(isset($_POST['r_submit'])){
if(!isset($r_password)){
echo "<td>Error: No Password has been entered!</td>";
}
}
?>
</tr>
<tr>
<td>Confirm Password<sup>*</sup>: </td>
<td><input class="input" type="password" name="confirm_r_password" value="<?php if(isset($confirm_r_password)){ print $_POST['confirm_r_password']; } ?>"/></td>
<?php
if(isset($confirm_password)){
if($confirm_r_password != $r_password){
echo "<td>Error: The passwords don't match!</td>";
}
}
?>
</tr>
</table>
</fieldset>
</form>
</div>
</td>
<td>
<div id="reg_form">
<form name="register_personal" action="register.php" method="post">
<fieldset>
<legend>Personal Data: </legend>
<table class="r_table_personal">
<tr>
<td>Name: </td>
<td><input class="input" type="text" name="r_name" value=""/></td>
</tr>
<tr>
<td>Surname: </td>
<td><input class="input" type="text" name="r_surname" value=""/></td>
</tr>
<tr>
<td>Date of Birth: </td>
<td><input class="input" type="text" name="r_dateofbirth" value=""/></td>
</tr>
<tr>
<td>E-mail<sup>*</sup>: </td>
<td><input class="input" type="text" name="r_mail" value="<?php if(isset($r_mail)){ print $_POST['r_mail']; } ?>"/></td>
<?php
if(isset($_POST['r_submit'])){
if(!isset($r_mail)){
echo "<td>Error: No E-mail has been entered!</td>";
}
}
?>
</tr>
</table>
</fieldset>
</form>
</div>
</div>
</td>
</tr>
<tr>
<td>Fields with an asterisk<sup>*</sup> are required for registry!
<div id="reg_content">
<form name="submit_registry" action="register.php" method="post">
<input class="submit" type="submit" name="r_submit" value="Submit!" />
</form>
</div>
</td>
</tr>
</table>
</div>
<div id="footerbreak"><br /></div>
<div id="footer"> © Jorik ter Molen & Camiel Collet, 2011.</div>
</body>
您的<form action="" method="post">在那里吗？
您还可以调试$_POST全局以查看发生了什么（如果数据正在命中您的脚本）
var_dump($_POST);
所以在代码后面的第二个php文件中包含了第一个"表单"页面，对吗？
首先，在PHP文件中，您应该添加所有
if(isset($_POST['submit'])){
分段为一：
if(isset($_POST['submit'])){
$r_username = $_POST['r_username'];
$r_password = $_POST['r_password'];
$confirm_r_password = $_POST['confirm_r_password'];
$r_name = $_POST['r_name'];
$r_surname = $_POST['r_surname'];
$r_birth = $_POST['r_dateofbirth'];
$r_mail = $_POST['r_mail'];
}
您的问题很可能在$_POST["submit"]中，因为您有两个检查，一个用于$_POST["submit’]，另一个用于$_POST['r_submit’]
除非你双向发送，否则我建议你更改PHP文件以检查"r_submit"
更新：
尝试将表单放入register.php页面，使其看起来像这样：
<?php
if(isset($_POST['r_submit'])){
$r_username = $_POST['r_username'];
$r_password = $_POST['r_password'];
$confirm_r_password = $_POST['confirm_r_password'];
}
?>
<form action="register.php" method="post">
<td>Username<sup>*</sup>: </td>
<td><input class="input" type="text" name="r_username" value="<?php if(isset($r_username)){ print $_POST['r_username']; } ?>"/></td>
<?php
if(isset($_POST['r_submit'])){
if(!isset($r_username)){
echo "<td>Error: No Username has been entered!</td>";
}
}
?>
</tr>
<tr>
<td>Password<sup>*</sup>: </td>
<td><input class="input" type="password" name="r_password" value="<?php if(isset($r_password)){ print $_POST['r_password']; } ?>"/></td>
<?php
if(isset($_POST['r_submit'])){
if(!isset($r_password)){
echo "<td>Error: No Password has been entered!</td>";
}
}
?>
</tr>
<tr>
<td>Confirm Password<sup>*</sup>: </td>
<td><input class="input" type="password" name="confirm_r_password" value="<?php if(isset($confirm_r_password)){ print $_POST['confirm_r_password']; } ?>"/></td>
<?php
if(isset($confirm_password)){
if($confirm_r_password != $r_password){
echo "<td>Error: The passwords don't match!</td>";
}
}
?>
</tr>
<input name="r_submit" type="submit" value="Submit" />
</form>
解决方案：
<html>
<head>
<title>Music Database</title>
<link rel="stylesheet" href="layout.css" type="text/css" />
<?php
// Verbinden met de database //
include('connect.php');
// Registreer data verkrijgen en in variabelen zetten //
if(isset($_POST['r_submit'])){
$r_username = $_POST['r_username'];
$r_password = $_POST['r_password'];
$confirm_r_password = $_POST['confirm_r_password'];
$r_name = $_POST['r_name'];
$r_surname = $_POST['r_surname'];
$r_birth = $_POST['r_dateofbirth'];
$r_mail = $_POST['r_mail'];
}
?>
</head>
<body>
<div id="login">
<form name="login" action="login.php" method="post">
<p>Login: <input class="input" type="text" name="username" value="Username" />
<input id="password" type="password" name="password" value="Password" /></p>
<div><a class="link" href="register.php">Register here!</a></div>
<p align="center"><input class="submit" type="submit" name="login_submit" value="Submit" /></p>
</form>
</div>
<div id="header">
<a class="link" href="index.php">Music Database</a>
</div>
<div id="search">
<form name="search" action="search.php" method="post">
<p>Search for: <input class="input" type="text" name="search" value="<?php if(isset($_POST['search'])) print $_POST['search']; ?>" />
<input class="submit" type="submit" name="search_submit" value="Submit" /></p>
<p>Artist: <input type="checkbox" name="artistsearch" checked />
Album: <input type="checkbox" name="albumsearch" />
Song: <input type="checkbox" name="songsearch" />
Genre: <input type="checkbox" name="genresearch" /></p>
</form>
</div>
<div id="wrapper"><br /></div>
<div id="content">
<h1>Register down here please:</h1>
<table id="wrap_table">
<tr>
<td>
<div id="reg_content">
<div id="reg_form">
<form name="register_login" action="register.php" method="post">
<fieldset>
<legend>Login Data: </legend>
<table class="r_table">
<tr>
<td>Username<sup>*</sup>: </td>
<td><input class="input" type="text" name="r_username" value="<?php if(isset($r_username)){ print $_POST['r_username']; } ?>"/></td>
<?php
if(isset($_POST['r_submit'])){
if(!isset($r_username)){
echo "<td>Error: No Username has been entered!</td>";
}
}
?>
</tr>
<tr>
<td>Password<sup>*</sup>: </td>
<td><input class="input" type="password" name="r_password" value="<?php if(isset($r_password)){ print $_POST['r_password']; } ?>"/></td>
<?php
if(isset($_POST['r_submit'])){
if(!isset($r_password)){
echo "<td>Error: No Password has been entered!</td>";
}
}
?>
</tr>
<tr>
<td>Confirm Password<sup>*</sup>: </td>
<td><input class="input" type="password" name="confirm_r_password" value="<?php if(isset($confirm_r_password)){ print $_POST['confirm_r_password']; } ?>"/></td>
<?php
if(isset($confirm_password)){
if($confirm_r_password != $r_password){
echo "<td>Error: The passwords don't match!</td>";
}
}
?>
</tr>
</table>
</fieldset>
</div>
</td>
<td>
<div id="reg_form">
<fieldset>
<legend>Personal Data: </legend>
<table class="r_table_personal">
<tr>
<td>Name: </td>
<td><input class="input" type="text" name="r_name" value=""/></td>
</tr>
<tr>
<td>Surname: </td>
<td><input class="input" type="text" name="r_surname" value=""/></td>
</tr>
<tr>
<td>Date of Birth: </td>
<td><input class="input" type="text" name="r_dateofbirth" value=""/></td>
</tr>
<tr>
<td>E-mail<sup>*</sup>: </td>
<td><input class="input" type="text" name="r_mail" value="<?php if(isset($r_mail)){ print $_POST['r_mail']; } ?>"/></td>
<?php
if(isset($_POST['r_submit'])){
if(!isset($r_mail)){
echo "<td>Error: No E-mail has been entered!</td>";
}
}
?>
</tr>
</table>
</fieldset>
</div>
</div>
</td>
</tr>
<tr>
<td>Fields with an asterisk<sup>*</sup> are required for registry!
<div id="reg_content">
<input class="submit" type="submit" name="r_submit" value="Submit!" />
</div>
</form>
</td>
</tr>
</table>
</div>
<div id="footerbreak"><br /></div>
<div id="footer"> © Jorik ter Molen & Camiel Collet, 2011.</div>
</body>
在第82行，您有php检查匹配密码，将其替换为：
<?php
if(isset($_POST['r_submit'])){
if($confirm_r_password != $r_password)
{
echo "<td>Error: The passwords don't match!</td>";
}
}
?>
尽管这只是一个基本的检查，没有什么安全的，因为用户可以将两个密码都留空，并且它们仍然匹配。